The waterproofing effect and mechanism of graphene oxide/silane composite emulsion on cement-based materials under compressive stress

Zhou, Zihan; Li, Shaochun; Cao, Jian Xin; Chen, Xu; Wu, Zihan; Zhou, Peijian

doi:10.1016/j.conbuildmat.2021.124945

Cited by 22 publications

(10 citation statements)

References 40 publications

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“…The silicate flocs deposited on the hydration product surface effectively weaken the evaporation of free water from the C−S−H gels. 46 In the second temperature interval, the cement samples covered with two types of Pickering emulsions have the highest thermogravimetric values of 4.39 and 4.55%, respectively. The breakage of the C−C and Si−O−C bonds leads to the rupture of the GO sheets and the peeling of the entire coatings, resulting in a large release of bound free water from the coating film.…”

Section: Resultsmentioning

confidence: 91%

“…The polymerization between the polysiloxane molecules and the hydration products is facilitated by the core–shell structure and the GO interface, enabling the formation of an extensive hydrophobic film. The silicate flocs deposited on the hydration product surface effectively weaken the evaporation of free water from the C–S–H gels . In the second temperature interval, the cement samples covered with two types of Pickering emulsions have the highest thermogravimetric values of 4.39 and 4.55%, respectively.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Composite Protective Coatings Coregulated by Core–Shell Structures and Graphene Oxide Interfaces

Hou

Yin

et al. 2022

ACS Appl. Mater. Interfaces

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The construction of multiple microstructures is a significant measure in improving the protective performance of composite polymer coatings. In this paper, a novel polystyrene acrylate–highly hydrophobic polysiloxane composite emulsion was fabricated by innovatively integrating the core–shell emulsion method and Pickering emulsion method through the interfacial stabilization and molecular polymerization regulation of graphene oxide, achieving a significant improvement in the compatibility of the thermoplastic core with a thermoset shell. The bonding degree between the polystyrene acrylate (PSA) component and the siloxane component is significantly improved in the synthesized composite emulsions, achieving the dual protection of the cementitious substrate with surface shielding and internal crystalline hydrophobicity. The capillary water absorption of the concrete treated with Pickering emulsions is reduced by over 98.3% with high hydrophobicity and low permeability. Meanwhile, the absolute ζ-potential and impedance of composite membranes reach over 45 mV and 109 ohms, respectively, giving the cementitious substrate excellent resistance to ionic attack and acid/alkaline corrosion. In addition, the composite membranes have excellent resistance to tensile cracking and physical erosion, maintaining a favorable adhesion level and plastic deformation under acid/alkaline attack and thermal aging, respectively.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Investigation of Composite Protective Coatings Coregulated by Core–Shell Structures and Graphene Oxide Interfaces

Hou

Yin

et al. 2022

ACS Appl. Mater. Interfaces

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“…That the improvement of fly ash as an integral filler of waterproofing concrete can improve the behavior of concrete, increase its ductility and strength. [32,33] The effect of fly ash composition on the modulus of elasticity of integral waterproofing concrete is shown in Figure 6. The equation obtained from this relationship is y = 52.…”

Section: Modulus Of Elasticitymentioning

confidence: 99%

Integral waterproofing concrete mechanical properties with the addition of fly ash

Nurtanto,

Roziqin,

Krisnamurti

et al. 2023

Res. Eng. Struct. Mater.

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DisclaimerAll the opinions and statements expressed in the papers are on the responsibility of author(s) and are not to be regarded as those of the journal of Research on Engineering Structures and Materials (RESM) organization or related parties. The publishers make no warranty, explicit or implied, or make any representation with respect to the contents of any article will be complete or accurate or up to date. The accuracy of any instructions, equations, or other information should be independently verified. The publisher and related parties shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with use of the information given in the journal or related means.Published articles are freely available to users under the terms of Creative Commons Attribution -NonCommercial 4.0 International Public License, as currently displayed at here (the "CC BY -NC").

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“…13−16 Silane materials have been widely used as hydrophobic coatings on concrete facilities. 17,18 To protect the surface of concrete blocks, Li et al 19 created a composite coating made of graphene oxide and isobutyltriethoxysilane (IBTS). Experiments on biofouling in the marine tidal zone revealed that the composite coating gave the concrete surface long-lasting hydrophobicity, limiting the attachment of marine microorganisms and successfully suppressing the development of microbial biofilms.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Such coatings can make the concrete resistant to biological inorganic acids and harmful ions. By doing so, the service life of the concrete can be extended, and the infrastructure can remain functional for longer periods of time. − Silane materials have been widely used as hydrophobic coatings on concrete facilities. , To protect the surface of concrete blocks, Li et al created a composite coating made of graphene oxide and isobutyltriethoxysilane (IBTS). Experiments on biofouling in the marine tidal zone revealed that the composite coating gave the concrete surface long-lasting hydrophobicity, limiting the attachment of marine microorganisms and successfully suppressing the development of microbial biofilms.…”

Section: Introductionmentioning

confidence: 99%

Acid Radical Tolerance of Silane Coatings on Calcium Silicate Hydrate Surfaces in Aggressive Environments: The Role of Nitrate/Sulfate Ratio

Jiang

Wang

et al. 2023

Langmuir

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Silane is known as an effective coating for enhancing the resistance of concrete to harmful acids and radicals that are usually produced by the metabolism of microorganisms. However, the mechanism of silane protection is still unclear due to its nanoscale attributes. Here, the protective behavior of silane on the calcium silicate hydrate (C–S–H) surface is examined under the attack environment of nitrate/sulfate ions using molecular dynamics simulations. The findings revealed that silane coating improved the resistance of C–S–H to nitrate/sulfate ions. This resistance is considered the origin of silane protection against harmful ion attacks. Further research on the details of molecular structures suggests that the interaction between the oxygen in the silane molecule and the calcium in C–S–H, which can prevent the coordination of sulfate and nitrate to calcium on the C–S–H surface, is the cause of the silane molecules’ strong adsorption. These results are also proved in terms of free energy, which found that the adsorption free energy on the C–S–H surface followed the order silane > sulfate > nitrate. This research confirms the excellent protection performance of silane on the nanoscale. The revealed mechanism can be further used to help the development of high-performance composite coatings.

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The waterproofing effect and mechanism of graphene oxide/silane composite emulsion on cement-based materials under compressive stress

Cited by 22 publications

References 40 publications

Investigation of Composite Protective Coatings Coregulated by Core–Shell Structures and Graphene Oxide Interfaces

Investigation of Composite Protective Coatings Coregulated by Core–Shell Structures and Graphene Oxide Interfaces

Integral waterproofing concrete mechanical properties with the addition of fly ash

Acid Radical Tolerance of Silane Coatings on Calcium Silicate Hydrate Surfaces in Aggressive Environments: The Role of Nitrate/Sulfate Ratio

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